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Is it safe to check floating point values for equality to 0?
...ality between double or decimal type values normally, but I'm wondering if 0 is a special case.
9 Answers
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Creating a zero-filled pandas data frame
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140
You can try this:
d = pd.DataFrame(0, index=np.arange(len(data)), columns=feature_list)
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dplyr summarise: Equivalent of “.drop=FALSE” to keep groups with zero length in output
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Since dplyr 0.8 group_by gained the .drop argument that does just what you asked for:
df = data.frame(a=rep(1:3,4), b=rep(1:2,6))
df$b = factor(df$b, levels=1:3)
df %>%
group_by(b, .drop=FALSE) %>%
summarise(count_a=length(a)...
Evenly distributing n points on a sphere
...orithm that can give me positions around a sphere for N points (less than 20, probably) that vaguely spreads them out. There's no need for "perfection", but I just need it so none of them are bunched together.
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Convert string[] to int[] in one line of code using LINQ
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answered Aug 19 '09 at 0:15
Ahmad MageedAhmad Mageed
85.1k1717 gold badges148148 silver badges167167 bronze badges
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How to smooth a curve in the right way?
...bove.
import numpy as np
import matplotlib.pyplot as plt
x = np.linspace(0,2*np.pi,100)
y = np.sin(x) + np.random.random(100) * 0.2
yhat = savitzky_golay(y, 51, 3) # window size 51, polynomial order 3
plt.plot(x,y)
plt.plot(x,yhat, color='red')
plt.show()
UPDATE: It has come to my attention t...
How to create a UIView bounce animation?
...r alloc] initWithItems:@[self.redSquare]];
elasticityBehavior.elasticity = 0.7f;
[self.animator addBehavior:elasticityBehavior];
And here are the results
UIKit Dynamics is a really powerful and easy to use addition to iOS7 and you can get some great looking UI from it.
Other examples:
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Text border using css (border around text)
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Use multiple text shadows:
text-shadow: 2px 0 0 #fff, -2px 0 0 #fff, 0 2px 0 #fff, 0 -2px 0 #fff, 1px 1px #fff, -1px -1px 0 #fff, 1px -1px 0 #fff, -1px 1px 0 #fff;
body {
font-family: sans-serif;
background: #222;
color: darkred;
}
h1 {
text-sha...
Numpy: Get random set of rows from 2D array
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200
>>> A = np.random.randint(5, size=(10,3))
>>> A
array([[1, 3, 0],
[3, ...